清水下泄条件下芦家河水道沙泓进口淤沙浅滩形成机理研究

三峡蓄水以来,清水下泄条件下芦家河水道发生明显冲刷,受河段边界条件、水动力条件、来水来沙条件影响,近年来沙泓进口河段泥沙淤积逐渐开始形成新的浅滩。分析了芦家河水道河道形态、水文泥沙、冲淤演变以及洲滩变化特征,在此基础上,结合河床演变机理,分析了芦家河水道沙泓进口淤沙浅滩主要影响因素,并对芦家河沙泓进口泥沙冲淤变化、滩槽变化以及水流条件变化趋势进行了预测。

Formation mechanisation of alluvial shoal in Lujiahe waterway Shahong inlet under low sediment concentration condition

Since the impoundment of the Three Gorges reservoir,Lujiahe waterway had been significantly eroded as the result of branch water from the reservoir.In recent years,the inlet of Shahong branch begun to deposit and formed a new shoal gradually,with the change of river boundary conditions,hydrodynamic condition and the incoming water and sediment condition.We analyze the channel morphology,hydrologic and sediment regimes,scour and silting evolution and beach distribution variations of Lujiahe waterway,based on which,we explain the deposition mechanism of Shahong inlet.Finally,we forecast the variation of sediment scouring and silting,beach morphology and river flow conditions in Shahong inlet area of Lujiahe waterway.